Cold Alfa ... solved
I've since moved as I do not subscribe to the free home delivery of snow, but back in the day I lived in Detroit and Chicago and the winters were hostile to Giulias.
In Detroit I had an enclosed garage and set up an infra-red lamp that would warm the crankcase. If I remembered to flip this on when I got up, the car would start.
Chicago was different - I had reserved parking but in a windswept open garage - nothing could actually fall on the car ... but nothing intercepted the infamous Chicago winds.
Growing tired of my Spyder being an object d'art for most of the winter I cast about for an answer and found it in a length of cable that connected the battery (in the trunk) with the coil (up front). The factory layout had a bus going from the battery to a distribution block under the hood, there the coil competed with the starter (and everything else) for juice.
The half-hour it took to route the jumper from stern to stem paid off immediately: from being a dicey start at 0 degrees, it went to reliable at -20. And maybe lower but when it was below -20 I didn't take time to note such things.
The Alfa in question: a '62 Spyder Veloce 1600 - after 50 years still my favorite ride after an XK-E, MGs, Honda Z, BRE 510, Rallye Capri, Supra, more Toyotas and various Lexi.